e8387c8e26
* Fix Event chaining in the on_load event handler return not working * added async tests * addressed comments
48 lines
1.2 KiB
Python
48 lines
1.2 KiB
Python
"""Base Pynecone middleware."""
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from __future__ import annotations
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from abc import ABC
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from typing import TYPE_CHECKING, List, Optional, Union
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from pynecone.base import Base
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from pynecone.event import Event
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from pynecone.state import Delta, State, StateUpdate
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if TYPE_CHECKING:
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from pynecone.app import App
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class Middleware(Base, ABC):
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"""Middleware to preprocess and postprocess requests."""
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async def preprocess(
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self, app: App, state: State, event: Event
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) -> Optional[Union[StateUpdate, List[StateUpdate]]]:
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"""Preprocess the event.
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Args:
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app: The app.
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state: The client state.
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event: The event to preprocess.
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Returns:
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An optional state to return.
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"""
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return None
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async def postprocess(
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self, app: App, state: State, event: Event, delta
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) -> Optional[Delta]:
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"""Postprocess the event.
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Args:
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app: The app.
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state: The client state.
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event: The event to postprocess.
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delta: The delta to postprocess.
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Returns:
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An optional state to return.
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"""
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return None
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